DE102008016356A1 - Circulation guide for rolling elements and thus equipped linear guide unit - Google Patents

Abstract

The invention relates to a circulation guide (1) for rolling elements (13) for use in a linear guide unit consisting of a carriage-like part (2) and a rail-like part (3), with at least one loaded rolling element row (Rb) and one unloaded during normal operation Rolling element row (Ru), wherein the circulation guide (1) is designed as a preassembled unit. Furthermore, the invention relates to a linear guide unit. It is proposed that the circulating guide (1) contains at least one component (10) for the rolling elements, which at least partially carries both the rolling element rows (Rb) loaded during normal operation and the unloaded rolling element rows (Ru). By this construction it is achieved that the parts requirement for the circulation guide (1) can be kept low, which on the one hand leads to a reduction of the manufacturing costs and on the other hand to a compact and stable form of the same.

Description

Name of the invention

bearing guide for rolling elements and thus equipped Linear guide unit

Field of the invention

The The invention relates to a circulation guide for rolling elements for use in one of a sled-like and a rail-like Part existing linear guide unit, with - in intended operation - at least a loaded and an unloaded row of rolling elements, wherein the circulation guide formed as a preassembled unit is. Furthermore, the invention relates to a linear guide unit.

Background of the invention

guideways for rolling elements are known Used when highly resilient and equally high-precision linear guides are to be realized. This can be, for example be the case with machine tools.

In As a rule, revolving guides have pairs of opposite ones Wälzkörperreihen, wherein each one loaded Rolling element row between suitable rolling element raceways the load between a fixed, sliding nenartigen component and a movable carriage-like component receives this, and the each other unstressed rolling element row the Function of a return of the rolling elements takes over into the loaded row of rolling elements. At the end of the rows of rolling elements are each suitable Deflection means provided, which is an overpass the rolling elements from one to another row of rolling elements enable.

To simplify the manufacturing effort and the assembly or disassembly for a linear guide unit, is from the DE 33 13 129 a generic circulation guide known. The circulation guide is designed such that the loaded and the unloaded Wälzkörperreihen are each realized by separate components that must be held together by means of a wire-shaped support member.

From the DE 20 2006 005 762 U1 a circulation guide is known in which to achieve the lowest possible height deflecting guides for deflecting the rolling elements in the loaded or unloaded Wälzkörperreihen are designed so that the deflection planes (ie the between the centers of the loaded and the centers of the unloaded Wälzkörperreihen each formed levels) to the plane formed between the centers of the loaded rows of rolling elements are at an angle which is less than 90 °.

Finally, out of the DE 695 05 961 T2 a linear guide unit is known in which a carriage-like component is guided by means of a circulation guide friction on a rail-like component. The carriage-like component in this case has a double-T-beam-shaped configuration with two downwardly projecting legs, which partially surround the rail-like component. The loaded rolling element rows are in each case arranged between the rail-like component and the legs of the carriage-like component. The unloaded rows of rolling elements, however, are arranged in incorporated channels of the legs of the carriage-like component.

Object of the invention

Of the Invention is based on the object, a circulation guide to provide that is compact and stable, a self-contained and preassembled unit forms and a comparatively low number of components needed. This task is done by a circulation guide with the features of claim 1 solved.

Of Furthermore, the invention is based on the object, a linear guide unit to imagine that is easy to assemble and disassemble and has a high load capacity. This task is done by a linear guide unit with the features of the claim 15 solved.

Summary of the invention

Of the Invention is based on the knowledge that through skillful training a circulation guide their compactness, stability and parts needs can be positively influenced, and that is a use such a circulation guide in a linear guide unit have a positive effect on their load bearing capacity can and ease of mounting the linear guide unit contributes.

The Invention is therefore based on a circulation guide for Rolling elements for use in one of a slide-like and a rail-like part existing linear guide unit, with - in normal operation - at least a loaded and a non-loaded row of rolling elements, wherein the circulation guide formed as a preassembled unit is. In addition, the invention provides that the circulation guide at least one component for the Contains rolling elements, which at least partly both the - in the intended Operation - loaded as well as the unloaded rows of rolling elements leads.

By This structure is achieved that the parts requirement for the Umlaufführung can be kept low, resulting in a Reduction of manufacturing costs leads. additionally By this measure, a compact and stable shape same allows.

The Subclaims describe preferred developments or Embodiments of the invention.

According to one The first development of the concept of the invention provides that said component is a component of a Wälzkörperlagerkäfigs or essentially forms this. This will be a double function realized of the component, which of course to another Reduction of necessary components leads.

According to one second embodiment of the invention, the component trough or tubular components, which is particularly beneficial is when spherical rolling elements used become.

According to one Further development of the inventive concept is provided that two loaded and two unloaded rows of rolling elements are provided, loaded by the centers of the two Wälzkörperreihen a first level and through the Centers of each loaded row of rolling elements and each of these associated unloaded Wälzkörperreihe each one further level is formed, the first level each with the other levels includes a certain angle. By this construction it is achieved that the circulation guidance in the installed state only little space needed or their Height is reduced.

It is beneficial if the between the first level and the other Levels each formed angle are approximately equal. This facilitates on the one hand the production of the circulation guide and on the other hand leads to a smoother operation Power flow. If doing so in the most convenient Way is provided that the angles are smaller than 90 °, preferably between 5 ° and 45 °, so allowed this is a particularly space-saving installation of the circulation guide.

It allows easier placement of the circulation guide with rolling elements, if advantageously at least a cover-like component for deflecting the rolling elements provided in the various Wälzkörperbahnen is. For equipping the circulation guide with rolling elements the lid-like component needs only to be removed so that the circulation guide or the Wälzkörperkäfig can be equipped with rolling elements.

at another expedient development of The idea of the invention is that the above-mentioned Component an elongated, plate-shaped component is fastened, which at least one rolling body track contains. In addition, the plate-shaped component while in cross-section a curved or angled shape and at least two contact surfaces, the thereto are suitable, with contact surfaces of the carriage-like Part of a linear guide unit brought into operative contact become. By these constructive measures, the plate-shaped Contribute component to stabilize the deflection guide and also serve to absorb bearing forces. Farther It is particularly advantageous if the contact surfaces the plate-shaped component and the contact surfaces of the carriage-like part each approximately at right angles to each other stand, resulting in a good reception of even in different Directions occurring bearing forces.

moreover is suitably provided that the above-mentioned component sealant for engagement with the rail-like Part of a linear guide unit, resulting in a increased protection of the circulation guide against contamination and optionally before loss of lubricant leads and thus increasing the service life of the device contributes.

Preferably the rolling elements are spherical, what about other forms of rolling elements an even more compact design and also a lighter production allows.

A Linear guide unit with a slide-like part and a rail-like part should at least one of the invention Contain circulation guide to achieve mounting benefits. Especially Advantageously, this linear guide unit should at least two circulation guides according to the invention contain the benefits of the invention To use circulation guidance as optimally as possible. So should at least one on each side of the rail-like part Circulation guide according to the invention arranged be. It is also possible to have more than two of the invention To arrange circulation guides, namely when a correspondingly long linear guide unit can be realized should.

It can be advantageously provided that the circulation guides arranged such that an X-arrangement of the printing lines the rolling element rows under load results. This will allow the recirculation guide only little space in the carriage-like part claimed and this can be made very stiff.

Furthermore, it is expedient if both the rail-like part and the carriage-like part Have recesses into which the component for receiving the rolling elements at least partially protrudes.

It can in an advantageous alternative embodiment of the invention Also be provided that the carriage-like part has rolling element raceways. This may expediently the shape of the component or the Wälzkörperkäfigs on the same which is between the rail-shaped and the sled-shaped Part resulting contour to be adjusted to a precise alignment of the component or the Wälzkörperkäfigs to facilitate.

Guide unit very comfortable adjustable, if the sled-like part several having approximately perpendicular legs, which is the rail-like Part at least partially embrace, being between the carriage-like Part and the rail-like part of the circulation guides arranged are, and wherein the groove-shaped recesses in the legs are incorporated and a tapered opening cross-section have, such that when pressing the wave-shaped Components in the groove-shaped recesses in each case a part the leg a bias increasing the deflection experiences.

alternative This can be a comfortable bias setting but also by it be realized very advantageous if the means for adjustment the bias voltage are formed as countersunk screws, wherein the carriage-like Part having a plurality of approximately vertically projecting leg, which is the rail-like part at least partially surround, with between the slide-like part and the rail-like part, the circulation guides are arranged, and wherein longitudinal slots incorporated in the legs are, in the area countersunk holes are incorporated, so, that when screwing the countersunk screws into the countersunk holes respectively a part of the legs a bias increasing the deflection experiences.

Brief description of the drawings

The The invention will be described below with reference to the accompanying drawings Embodiments explained in more detail. It shows

1 a first embodiment of a circulation guide according to the invention in a sectional view,

2 A second embodiment of a circulation guide according to the invention in a perspective exploded view without rolling elements,

1 a first embodiment of a circulation guide according to the invention in a sectional view,

2 A second embodiment of a circulation guide according to the invention in a perspective exploded view without rolling elements,

3 a linear guide unit with built-in circulation guides according to the invention, in a cross-sectional view,

4 A third embodiment of a mounted in a carriage-like part circulation guide according to the invention in a cross-sectional view,

5 a representation of a linear guide unit according to the sectional profile VV in 3 but without a rail-like part,

6 a perspective view of the linear guide unit according to 5 with a rail-like part, whereby the circulation guides are not visible,

7 a representation of an elongated linear guide unit comparable with 5 in which two circulating guides according to the invention are mounted one behind the other,

8th a cross-sectional view of an alternative linear guide unit, which is designed as a torque ball bush,

9 a cross-sectional view of another alternative linear guide unit in the form of a driven linear axis,

10 a representation of a modified linear guide unit according to 3 , wherein additional means for adjusting the bias voltage are provided,

11 a detailed representation of the adjustment means according to 10 , and

12 a representation similar 10 , wherein for symmetry reasons only one side of the guide unit is shown, with modified means for adjusting the bias voltage

Detailed description the drawings

First, on the 1 Referenced, in which a circulation guide according to the invention 1 is shown. The circulation guide 1 is symmetrical to an imaginary center line M and has one of several parts 10 . 11 existing rolling element cage on. The part 10 the Wälzkörperkäfigs has a guide trough 100 , in the spherical rolling body 13 are guided. Likewise, the part points 11 the Wälzkörperkäfigs a guide trough 110 on, leading to the rolling elements 13 serves. The two guide channels 100 and 110 complement each other to a tubular guide channel.

It can also be seen that the part 11 a middle section 111 approximately in the region of the center line M, wherein between the middle part 111 and the part 10 as well a guide channel for the rolling elements 13 is trained. For this purpose have the parts 10 and the middle part 111 correspondingly designed, unspecified concave surfaces in these areas.

The in the parts 10 and 11 the rolling element cage guided rolling elements 13 form with respect to an acting load unloaded rows of rolling elements Ru and loaded rows of rolling elements Rb, each of a loaded rows of rolling elements Rb is associated with an unloaded Wälzkörperreihen Ru. The rolling elements 13 the unloaded Wälzkörperreihen Ru be fed back to the loaded row of rolling elements Rb and vice versa. As can also be seen, is formed by the centers of the loaded rows of rolling elements Rb a plane Eb and through the centers of the loaded rows of rolling elements Rb and the centers of these respective unloaded Wälzkörperreihen Ru two levels Eu1 and Eu2, said planes Eb and Eu1 or Eu2 each include a preferred angle γ1 and γ2 with each other. Due to the already mentioned symmetry of the circulation guidance 1 If the angles γ1 and γ2 formed are of course the same, they can deviate from each other if there is no symmetry.

Furthermore, in 1 recognizable that in cross-section in approximately C-shaped bent or angled support plate 12 with contact surfaces 120 is present, which are aligned approximately at right angles to each other. Furthermore, the support plate 12 with concave bearing surfaces 121 for the rolling elements 13 equipped and has at their viewed in cross-section angled ends in approximately mutually perpendicular mounting surfaces 122 on, which in corresponding recesses of the Wälzkörperkäfigs (part 110 ) intervene.

To a tightness of the circulation guide 1 to ensure that are at the part 10 of the rolling element cage sealing lips 101 provided or molded. The support plate 12 is preferably made of a high strength material, such as steel, while the parts 10 and 11 the Wälzkörperkäfigs are preferably made of plastic. Finally, it should be noted that the circulation leadership 1 could also be divided along the center line M, but this is not shown in detail. Such a circulation guide would then contain only one loaded and one unloaded row of rolling elements.

2 shows one to 1 alternative circulation guidance 1' consisting of a rolling element cage 10 ' , which two removable cage lid 14 having. The cage lid 14 be frontally into the Wälzkörperkäfig 10 ' pressed and have corresponding suitable, not closer visible deflection paths for the rolling elements 13 on, so that a deflection between the Wälzkörperreihen Ru, Rb is ensured (such cage cover are of course also in the circulation guide 1 used, but they have not been shown). Furthermore, again is a support plate 12 , as in 1 already described in more detail provided. In contrast to circulation guidance 1 is the rolling element cage 10 ' the circulation guide 1' made in one piece and has tubular components in which the Wälzkörperreihen Ru, Rb are performed. In 2 No rolling elements are shown.

In 3 is now a linear guide unit with mounted deflection guides according to the invention 1 seen. The linear guide unit consists of a guide carriage 2 , which longitudinally displaceable on a guide rail 3 is held. The guide carriage 2 has approximately the shape of an inverted U with two downwardly projecting legs 23 on which the guide rail 3 surmount or encompass each other on both sides. Between the guide carriage 2 and the guide rail 3 are each the circulation guides according to the invention 1 arranged.

In this case, the guide carriage 2 recesses 20 and the guide rail 3 recesses 30 for the rolling element cage of the circulation guides 1 on. It can be seen that the Wälzkörperkäfig only while maintaining a distance in the recesses 20 respectively 30 protrudes, but there no contact with the carriage 2 or with the guide rail 1 Has.

Furthermore, the guide rail 3 Raceways 31 for the rolling elements 13 and sealing surfaces 32 to the concern of the sealing lips 101 on. The thigh 23 of the guide carriage 2 are with approximately perpendicular contact surfaces 21 provided with the in 1 described contact surfaces 120 the support plate 12 interact. Due to the approximately rectangular orientation of the contact surfaces 120 respectively 21 is a good shot of on the slide 2 acting compressive forces F1 or tensile forces F2 possible. The force lines KF2 and KF1 acting approximately in tension or compression force are indicated by dashed lines. It is therefore understandable that the lack of contact between the Wälzkörperkäfigen and the already mentioned recesses 20 respectively 30 the load F1 or F2 exclusively on the support plate 12 the deflection guides 1 to get redirected. At the indicated by dashed lines pressure lines can be seen that the circulation guides 1 are mounted so as to give an X-arrangement of the printing lines. Finally, there are still blind holes 22 worth mentioning, by means of which translationally moving components on the guide carriage 2 can be attached.

The use of the support plate 12 also offers the advantage of being in the guide carriage 2 or in his thighs 23 no complicated to be processed bearing surfaces must be provided. With damaged bearing surfaces 121 For example, a simple replacement of the designed as a preassembled unit circulation guide ranges 1 ,

4 shows an alternative running carriage 2 ' in which also alternatively executed circulating guides 1'' be used. The circulation guides 1'' are with their rolling element cages 10 '' directly into corresponding, unspecified numbered recesses of the guide carriage 2 ' used, the guide carriage 2 ' now thighs 23 ' with incorporated bearing surfaces 28 having. By doing so dispensing with the support plate 12 There is an increase in the rigidity of the linear guide system. The material of the guide carriage 2 ' is preferably a hardenable steel, wherein the bearing surfaces 28 were finished after the heat treatment in order to achieve a sufficient running accuracy and wear resistance can. Again, the orbits are 1'' again executed as a pre-assembled units.

In 5 is a view of the linear guide unit according to the section VV in 3 shown, however, the guide rail 3 was omitted. Here is the guide in the carriage 2 built-in circulation guide 1 with the part 10 from the rolling element cage, the sealing lips 101 as well as the rolling elements 13 seen. Furthermore, the front in the Wälzkörperkäfig inserted lid 14 to recognize or are indicated by dashed lines, which the frontal cover and deflection of the rolling elements 13 to the task. Furthermore, at both ends of the guide carriage 2 an end plate 4 to recognize which for covering and securing the circulation guide 1 in the guide carriage 2 serves.

6 shows a perspective view of the linear guide unit according to 3 , wherein only the guide carriage 2 with the end plates 4 as well as the guide rail 3 is shown. Furthermore, the above-mentioned blind holes 22 clearly visible.

The 7 shows a representation of another alternative linear guide unit with an axially elongated guide carriage 2 '' , wherein, in contrast to the linear guide unit of 5 two circulation guides 1 are axially mounted one behind the other, which allows the extension of the linear guide unit. Of course, it is also the assembly of more than two circulation guides 1 realizable.

In 8th Now, another alternative embodiment for a linear guide unit is shown, namely a torque ball bushing with a profiled shaft serving as a guide rail 5 and a ball bushing serving as a guide carriage 6 , Between the profile shaft 5 and the ball socket 6 are two circulation guides according to the invention 1 mounted in an X-arrangement.

9 shows a further embodiment of a linear guide unit according to the invention, in the form of a driven linear axis 8th , which by means of inventive trained circulation guides 1 (It is only a cross-sectional side of the linear guide unit shown) on a U-profile-like guide rail 7 is guided.

10 shows a representation that with 3 is comparable, with waves 9 in longitudinal grooves 24 the thigh 23 of the guide carriage 2 be pressed to achieve a bias. 11 shows in a detailed view the application and effect of a biasing force Fv. It can be seen that the groove 24 an upper, approximately horizontally oriented wall 240 and a lower, inclined at an angle β wall 241 having. Once the wave 9 with a preload force Fv (see arrow) in the groove 24 is pressed, this groove 24 spread and the lower part of the thigh 23 slightly angled inwards so that it occupies the dashed line indicated position and the rolling elements 13 the loaded rows of rolling elements Rb are held under pretension.

Finally, in 12 an alternative way of generating a bias by means of countersunk screws 27 shown. Here are the thighs 23 of the guide carriage 2 each with a continuous longitudinal slot 25 provided, the radially inward into a longitudinal bore 250 passes. Along the longitudinal slots 25 are preferably a plurality of evenly spaced counterbores 26 arranged. Now be the countersunk screws 27 into the counterbores 26 screwed in, then the longitudinal slot 25 spread and the lower part of the thigh 23 performs a similar deflection as already related to the 10 illustrated embodiment has been described.

1, 1 ', 1' '

bearing guide

10 10 ', 10' '

part from the rolling element cage

100

guide trough

101

sealing lip

11

part from the rolling element cage

110

guide trough

111

Midsection of the part 11

12

support plate

120

contact surfaces the support plate

121

Raceways the support plate

122

mounting surfaces the support plate

13

spherical rolling elements

14

cover from the rolling element cage

2, 2 ', 2' '

Guide carriage, sled-like part

20

recesses for the rolling element cage

21

contact surfaces of the guide carriage

22

blind hole

23 23 '

leg of the guide carriage

24

groove in the thighs of the guide carriage

240

Upper Wall of the groove

241

Lower Wall of the groove

25

longitudinal slot

250

longitudinal bore

26

countersink

27

Senkschraube

28

Bearing surface of the guide carriage

3

Guide rail, rail-like part

30

recesses the guide rail

31

Raceways the guide rail

32

sealing surfaces the guide rail

4

endplate

5

profile shaft

6

ball socket

7

U-profile-like guide rail

8th

linear axis

9

waves

α

angle between the planes of the rolling element rows

β

angle of attack

γ1, 2

angle between the levels Eb and Eu

Eb

By the centers of the loaded rows of rolling elements educated level

eu1, 2

By the centers of the loaded and the respectively assigned unloaded Rolling elements formed plane

F1

On the guide carriage acting pressure force

F2

On the guide carriage acting tensile force

Fv

preload force

KF1

power lines at pressure

KF2

power lines at traction

M

center line

Rb

loaded rows of rolling elements

Ru

unloaded rows of rolling elements

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 3313129 [0005]
• - DE 202006005762 U1 [0006]
• - DE 69505961 T2 [0007]

Claims (22)

Circulation guide ( 1 . 1' . 1'' ) for rolling elements ( 13 ) for use in one of a carriage-like part ( 2 . 2 ' . 2 '' . 6 . 8th ) and a rail-like part ( 3 . 5 . 7 ) existing linear guide unit, with - in normal operation - at least one loaded (Rb) and an unloaded (Ru) Wälzkörperreihe, the circulation guide ( 1 . 1' . 1'' ) is designed as a preassemblable unit, characterized in that the circulation guide ( 1 . 1' . 1'' ) at least one component ( 10 . 10 ' . 10 '' ) for the rolling elements ( 13 ), which at least partially both the - in normal operation - loaded rows of rolling elements (Rb) and the unloaded rows of rolling elements (Ru) leads. Circulation guide according to claim 1, characterized in that the component ( 10 . 10 ' . 10 '' ) Is part of or forms a bearing cage substantially. Circulation guide according to one of the preceding claims, characterized in that the component ( 10 . 10 ' . 10 '' ) channel-shaped components ( 100 . 110 ) or tube-like components. Circulation guide to one of the previous Claims, characterized in that two loaded Rolling elements (Rb) and two unloaded (Ru) Wälzkörperreihen are provided, wherein the centers of the two loaded rows of rolling elements (Rb) a first level (Eb) and through the centers of each loaded row of rolling elements (Rb) and the latter respectively associated unloaded Wälzkörperreihe (Ru) in each case a further plane (Eu1; Eu2) is formed, wherein the first level (Eb) with the other levels (Eu1, Eu2) one each certain angle (γ1; γ2). Circulation guide to one of the previous Claims, characterized in that between the first level (Eb) and the second level (Eu1; Eu2) respectively formed Angles (γ1; γ2) are approximately equal. Circulation guide according to claim 4 and / or 5, characterized characterized in that the angles (γ1, γ2) are smaller than 90 °, preferably between 5 ° and 45 °. Circulation guide according to one of the preceding claims, characterized in that at least one lid-like component ( 14 ) is provided for deflecting the rolling elements in the different Wälzkörperbahnen (Rb or Ru). Circulation guide according to one of the preceding claims, characterized in that on the component ( 10 . 10 ' ) an elongate, plate-shaped component ( 12 ), which has at least one rolling body raceway ( 121 ) contains. Circulation guide according to one of the preceding claims, characterized in that the plate-shaped component ( 12 ) has a curved or angled shape in cross-section. Circulation guide according to one of the preceding claims, characterized in that the plate-shaped component ( 12 ) at least two contact surfaces ( 120 ), which are suitable for contact surfaces ( 21 ) of the carriage-like part ( 2 ) of a linear guide unit to be brought into operative contact. Circulation guide according to one of the preceding claims, characterized in that the contact surfaces ( 120 ) of the plate-shaped component ( 12 ) and the contact surfaces ( 21 ) of the carriage-like part ( 2 ) each approximately at right angles to each other. Circulation guide according to one of the preceding claims, characterized in that the component ( 10 . 10 ' . 10 '' ) Sealant ( 101 ) for engagement with the rail-like part ( 3 ) has a linear guide unit. Circulation guide according to one of the preceding claims, characterized in that the rolling bodies ( 13 ) are spherical. Linear guide unit with a carriage-like part ( 2 . 2 ' . 2 '' ) and a rail-like part ( 3 . 5 . 7 ), characterized in that this at least one circulation guide ( 1 . 1' . 1'' ) according to at least one of the preceding claims. Linear guide unit according to claim 14, characterized in that these two circulating guides ( 1 . 1' . 1'' ) according to at least one of claims 1 to 13. Linear guide unit according to one of the preceding claims, characterized in that the circulation guides ( 1 . 1' . 1'' ) are so angeord net that results in an X-arrangement of the pressure lines of standing under load Wälzkörperreihen (Rb). Linear guide unit according to one of the preceding claims, characterized in that both the rail-like part ( 2 . 2 ' ) as well as the carriage-like part ( 3 ) Recesses ( 20 respectively. 30 ) into which the component ( 10 . 10 ' . 10 '' ) for the rolling elements ( 13 ) at least partially protrudes. Linear guide unit according to one of the preceding claims, characterized in that the carriage-like part ( 2 ' ) Rolling element raceways ( 28 ) having. Linear guide unit according to one of the preceding claims, characterized in that means ( 9 . 24 ; 25 . 26 . 27 ) are provided for adjusting a bias voltage. Linear guide unit according to one of the preceding claims, characterized in that the means ( 9 . 24 ; 25 . 26 . 27 ) for adjusting a bias voltage as wave-shaped components ( 9 ) are formed, which in groove-shaped recesses ( 24 ) of the carriage-like component ( 2 ) are depressible. Linear guide unit according to claim 20, characterized in that the carriage-like part ( 2 ) a plurality of approximately vertically projecting legs ( 23 ) having the rail-like part ( 3 ) at least partially engage, wherein between the carriage-like part ( 2 ) and the rail-like part ( 3 ) the circulation guides ( 1 ) are arranged, and wherein the groove-shaped recesses ( 24 ) in the thighs ( 23 ) are incorporated and have a tapered opening cross-section, such that when pressing the wave-shaped components ( 9 ) in the groove-shaped recesses ( 24 ) each part of the legs ( 23 ) experiences a preload-increasing deflection. Linear guide unit according to claim 20, characterized in that the means for adjusting the bias as countersunk screws ( 27 ), wherein the carriage-like part ( 2 ) a plurality of approximately vertically projecting legs ( 23 ) having the rail-like part ( 3 ) at least partially engage, wherein between the carriage-like part ( 2 ) and the rail-like part ( 3 ) the circulation guides ( 1 ) are arranged, and wherein longitudinal slots ( 25 ) in the thighs ( 23 ), in the area of countersunk holes ( 26 ) are provided, such that when screwing the countersunk screws ( 25 ) in the counterbores ( 26 ) each part of the legs ( 23 ) experiences a preload-increasing deflection.